@jock @Max Sterg thats correct the first time the image only occupied some GigaByte , after first run is enlarge .
But you you can also put , after burn the sd card , the images as a compressed file on it (tar.zx or something like that) the multitool can decompress this file on the fly ( at the moment this tool burn the image to the box)
the one gig is enough for that desktop image